Overboarding a floor

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As usual I have so many questions.

So, from what I can tell "no more ply" is a cement based board. And I cannot find anything saying that it is not in fact extremely similar to Hardibacker and Aquapanel boards. Sounds like the same stuff. Or does it have some other magic ingredient in it?

As far as my experience and common sense goes, there is no way that a 6mm sheet of anything cannot be flexible over a board size. Especially when compared to 18mm ply. However, I can believe (I think) that it is rigid enough when glued to a floor to make that floor rigid enough to tile on. This is of course so long as the original floor is fairly rigid. Floorboards being screwed down into joists etc. Perhaps if the joists themselves are bouncy, then they need extra noggins etc.

However, perhaps my usual belt and braces method, though effective, is perhaps total overkill for most situations. Perhaps I can get away with "no more ply" in future. Laminates are extremely strong, and glueing this board to an existing floor is creating a laminate. The polyurethane glue is damn strong stuff, I've used similar before to glue a Wedi shower tray together.

Unfortunately, bounce in floors is a subjective discussion. So its impossible on a forum to judge how much flex a floor can or cannot have before tiling it. I would be very interested to see how many people are using "no more ply" on the forum - with success or without.

Paul
PT HomeImprovement
 
I had my doubts too but was forced to use it on a kitchen floor that had a sliding door as a ply overlay alone would have been higher than the framework of the door. I was so impressed with the NMP I often use it and have never had a problem, but then I wouldn't just screw and glue it down on a 'bouncy' floor.

As has been said already, I don't believe a 6mm cement board can provide the same strength of 18mm ply, but if the sub floor is made strong and NMP used correctly then it really becomes a very solid floor indeed and is a much better substrate to tile to compared with ply which is moisture and temperature sensitive.

BS state 10mm cement board as min for overlay.
 

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